It’s still technically summer but snow is falling in the Sierra along the California-Nevada line.

California transportation officials posted a photo on the Caltrans District 3 Twitter account shortly after noon Monday showing snow accumulating on U.S. Interstate 80 at the top of Donner Summit about 10 miles (16 kilometers) west of Truckee, California.

Caltrans is urging motorists to slow down.

A strong cold front packing winds gusting up to 50 mph (80 kph) sent sending temperatures plummeting Monday across western Nevada.